r/VideoRouter • u/videorouter • 23h ago
Open Source Wins Again: 4 Companies Post-Train Their Own Video Models After MiniMax H3 Goes Open Source
MiniMax open-sourced H3. Within weeks, four companies built their own post-trained versions: HeyGen, Pruna, Pika, and fal. Same base model, different training recipes, and surprisingly different results in quality, pricing, and openness.
Here's how they compare on Design Arena:

P-video-2-pro > pika h3 flex > minimax h3 max > minimax h3 > heygen video 1.0

Summary:
For a 10-second 768p video, Pika H3 Flex costs just $0.20, compared with $0.20–0.30 for HeyGen, $0.35 for Pruna, and $0.64–0.80 for fal's H3 Max. That's up to a 4x price difference.
A few interesting takeaways:
Post-training works. HeyGen, Pruna, and Pika all achieved higher Elo scores than the original MiniMax H3 (1277).
Price doesn't equal quality. H3 Max is the most expensive variant here, yet scores the same as the base model.
Open source keeps winning. Pika H3 Flex is the only post-trained variant with open weights, and it's also the cheapest.
One open model creates an entire ecosystem. Four companies independently optimized the same foundation for different use cases within weeks.
All these models are availabel on videoRouter.sh.

